Question: What are the castle which start with the letter o
Paraphrase: What are the palace which begin with the letter o
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q23413 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'ö')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Ödenburg, Ödenburg, Örbyhus Castle, Örbyhus Castle, Örebro Castle, Örebro Castle